Zobrazeno 1 - 10
of 5 573
pro vyhledávání: '"A. Kanak"'
Autor:
Pandey, Pushpak, Saha, Kanak
Estimating the true background in an astronomical image is fundamental to detecting faint sources. In a typical low-photon count astronomical image, such as in the far and near-ultraviolet wavelength range, conventional methods relying on the 3-sigma
Externí odkaz:
http://arxiv.org/abs/2411.17566
We report the detection of 5 newly identifed Lyman-continuum (LyC) leaker candidates at redshifts 0.99-1.42 in the AstroSat UV Deep Field South F154W image. We derive physical properties of these galaxies using a combination of spectral-energy distri
Externí odkaz:
http://arxiv.org/abs/2410.09515
Autor:
Sarkar, Suchira, Saha, Kanak
We study massive disk galaxies (stellar mass $>$= 10$^{11}$ M$_{\odot}$ ) at $z=0$ from IllustrisTNG simulation to detect galaxies that contain two exponential stellar disks - a central high surface brightness (HSB) disk surrounded by an extended low
Externí odkaz:
http://arxiv.org/abs/2409.20309
Galaxy chemical enrichment mechanisms have primarily been constrained by [$\alpha$/Fe] and [Fe/H] measurements of individual stars and integrated light from stellar populations. However such measurements are limited at higher redshifts (z>1). Recentl
Externí odkaz:
http://arxiv.org/abs/2408.13396
AstroSat UV Deep Field South -- I. Far and Near-ultraviolet Source Catalog of the GOODS South region
Autor:
Saha, Kanak, Maulick, Soumil, Pandey, Pushpak, Bhattacharya, Souradeep, Borgohain, Anshuman, Mondal, Chayan, Rafelski, Marc, Kataria, Manish, Teplitz, Harry I., Tandon, Shyam N., Windhorst, Rogier A., Elmegreen, Bruce G., Herenz, Edmund Christian, Rutkowski, Michael
We present the AstroSat UV Deep Field South (AUDFs), an imaging survey using the wide-field Ultraviolet Imaging Telescope on board AstroSat. AUDFs covers $\sim 236$ arcmin$^{2}$ of the sky area, including the Great Observatories Origins Deep Survey (
Externí odkaz:
http://arxiv.org/abs/2408.03629
We report the detection of Lyman-continuum (LyC) photons from a massive interacting system at $z=1.097$ in the Hubble Ultra Deep Field. The LyC detection is made in the far-ultraviolet F154W band of the UVIT telescope onboard AstroSat. Both JWST and
Externí odkaz:
http://arxiv.org/abs/2407.05906
Autor:
Mondal, Chayan, Saha, Kanak
The relation between the observed UV continuum slope ($\beta$) and the infrared excess (IRX) is used as a powerful probe to understand the nature of dust attenuation law in high-redshift galaxies. We present a study of 83 UV-selected galaxies between
Externí odkaz:
http://arxiv.org/abs/2405.11544
Recent surveys have demonstrated the widespread presence of UV emission in early-type galaxies (ETGs), suggesting the existence of star formation in many of these systems. However, potential UV contributions from old and young stars, together with mo
Externí odkaz:
http://arxiv.org/abs/2403.12160
Autor:
Dhiwar, Suraj, Saha, Kanak, Maulick, Soumil, Smith, Brent M., Mondal, Chayan, Teplitz, Harry I., Rafelski, Marc, Windhorst, Rogier A.
We report the direct detection of Lyman Continuum (LyC) emission from 9 galaxies and 1 Active Galactic Nuclei (AGN) at $z$ $\sim$ 1.1-1.6 in the GOODS-North field using deep observations from the Ultraviolet Imaging Telescope (UVIT) onboard AstroSat.
Externí odkaz:
http://arxiv.org/abs/2401.13269
We present results from our deep Far-ultraviolet (FUV) survey using {\em AstroSat}/UVIT of a filamentary structure at $z$ $\sim$ $0.072$. A total of four filaments comprising 58 galaxies were probed in our study. We detect 18 filament galaxies in our
Externí odkaz:
http://arxiv.org/abs/2401.13073